Chair-iron.



PATENTED MAY 9, 1905.

' H. W. BOLENS.

CHAIR IRON.

APPLICATION I'XLED T11R19. 1903.

2 SHEETS-SHEET 1 /70/ V/4f 6725 A 4% W No. 789,481. PATENTED MAY 9, 1905.,

H. W. BOLENS.

CHAIR IRON.

AIPLIQATION FILED JAN. 19. 1903' 2 SHEETS-SHEET 2 vation of the same.

' UNTTED STATES Patented May 9, 1905.

PATENT OEEIcE.

CHAIR-IRON.

SPECIFICATION forming part of Letters ?a.tent N0. 789,481, dated May 9, 1905.

Application filed January 19, 1903. Serial No. 139,678.

To all whom, it may concern:

Be it known that I, HARRY W. BoLuNs, a citizen of the United States, residing at Port Washington, in the county of Ozaukee and State of WVisconsin, have invented new and usefulImprovements in Chair-Irons, of which the following is a specification.

This invention relates to improvements in chair-irons employed in revolving and tilting chairs.

The objects in View are to produce a chairiron that combines cheapness of manufacture and strength and is compact and ellicient.

\Vith these general objects in view the invention consists in certain features of construction hereinafter apparent and particularly pointed out in the claims.

Referring to the drawings, Figure 1 is a central vertical sectional view of a chair-iron embodying my invention. Fig. 2 is a side elc- Fig. 3 is a detail similar to Fig. 1, but taken at one side of the vertical center of the iron. Fig. 4 is a top plan view of the iron, and Fig. 5 is a rear elevation thereof.

Similar numerals of reference refer to similar parts throughout the drawings.

Upon the upper end of the usual threaded spindle 1 is the swell or boss 2, at one side of which latter is integrally cast the standard 3. The standard 3 comprises a central transverse horizontal bridge or spanner piece 4, opposite depending bearing-lugs 5, and a central vertical plate 6.

For a purpose hereinafter apparent I have added to this usual and wellknown construction and east integral therewith opposite end shoulders 7 provided at their front with inclined faces 8, each of said shoulders constituting a stop to limit the backward tilting of the chair.

The plate 6 is provided with a hole or holes 9 for the accommodation of the usual threaded tension rod or rods 10, the rear ends of which rods carry heads 11 and the front ends threaded to receive adjusting-wheels 12. Between the inner end of the wheel 12 and the face of the plate 6 is interposed a nut 13, which nut is loose on the rod and also movable on the face of the plate, so as to accommodate the rod to different inclinations as may be caused by the tilting of the chair-seat.

The spider-frame 14 comprises a pair of depending end lugs 15 and'transverse connecting portion 16 and a forwardly-disposed spider-arm 17, the whole being cast integral. The lugs 15 are perforated at 18 in line with similar perforations 19, formed in the bearing-lugs 5, and the two are connected by the usual horizontal spindle 20, whereby, as will be apparent, the spider-frame is capable of swinging back and forth upon the lower stationary part of the iron. In order to give ample strength to the front spider-arm, I prefer to make the same somewhat in the form of a plate, as best shown in Fig. 4-, and 1 also form a recess in the arm, as indicated at 21, so that the hand-wheel 12 may extend within the opening, thus enabling me to condense the parts, so to speak, and making on the whole a shorter iron. On the rear side of the transverse connecting portion 16 is formed the usual seat or seats 22 for the tension spring or springs 23, the opposite or rear ends of the said spring or springs resting against the head or heads 11.

It has heretofore been customary to provide a back-stop for the purpose of limiting the rearward swing of the spider-frame, and hence the seat, by providing a lug on the spider-arm 17, designed to strike against the upper end of the plate 6. For this purpose, however, I employ the stop-shoulders 7 in connection with similar but oppositely-inclin ed stop-shoulders 24:, formed at the inner sides of the depending lugs 15. The opposing faces of these stop-shoulders are spaced a sufficient distance apart to permit of the desired limited movement upon the part of the chair-spider, and hence the chair-seat, before the two shoulders 24 abut against the shoulders 7, thus forming a solid stop at each side of the iron.

In this class of iron also it has been usual to cast integral with the spider-frame oppositely-disposed spider-arms; but it is one of the objects of this invention to obviate the employment of such arms and their resulting weakness and to substitute in this structure a means whereby I may substitute the now more universally employed sheet-steel arm. For this purpose I cast or otherwise produce at the opposite ends of the transverse portion 16 of the spider-frame transversely-alining horizontal and preferably concaved spider-arm seats 25 and in them mount a transverse spider-arm 26, that may be arched or otherwise formed in cross-section to conform to the seats and which is preferably formed up out of sheet steel. The ends of the arm are flared and perforated, as at 27, and are therefore designed to be attached to the under side of a chair-seat the same as are the castiron arms, and it is held in position in the alining seats in any desired manner-as, for instance, by ordinary rivets 28.

Of course it will be obvious that the shape of the sheet-metal arms may be varied and likewise the seat to conform therewith, and means other than rivets may be employed to secure the sheet-metal arm in position. By a very slight variation a sheet-metal arm may be substituted for the cast-iron arm 17 and, in fact, the invention in other details varied and yet not depart from the spirit of my invention or the scope of the claims.

By only casting the front or one spider-arm integral with the spreader and producing merely short seats for the remaining arms I am enabled to greatly increase and facilitate the output of the article. It will be observed that by thus decreasing the width of the spreader the mold may be caused to accommodate a greater number, whereas with the present arrangement,wherein the arms are all cast integral, but one spreader can be cast at a time. This of course results in a great reduction of the manufacturing cost, as it enables one molder to accomplish as much as two or four,1n accordance with the size of the mold used.

Havingdescribed my invention, what I claim 1s- 1. In a chair-iron,the combination of a lower pivotal base provided at its opposite ends with upwardly-disposed abutting shoulders having inclined faces and below the same having bearing-lugs, and a spider-frame having depending lugs embracing the lugs of the said base and pivotally connected thereto, said lugs of the spider-frame being provided on their inner faces with stop-shoulders having inclined faces and arranged to contact with those of the base when said spider-frame is tilted toa certain point or degree.

2. In a chair-iron, the combination with the lower pivotal base having the centrally-located upwardly-disposed perforated plate, the tension-bolt and its spring, of the pivoted spider-frame provided at its front with the spider-arm 17 flared and having an opening, and at its rear the depending portion 16, having the boss or seat 22 and the hand-Wheel located on the bolt and having its upper portion extended into the opening in said spiderarm, the spring 23 seated on the boss, and head 11.

3. A cast-metal chair-spider comprising an integrally-formed spider-arm flared and provided with an opening, and a spider-arm seat arranged in the rear thereof and at an angle thereto, combined with an independent spiderarm mounted in said seat, and a spring-tension device located in said spider and provided with an adjusting-Wheel extending into said opening.

In testimony whereof I aflix my signature in presence of two Witnesses.

HARRY l/V. BOLENS.

Witnesses:

E. BARELMAN, OHAs. J. TRAVERS. 

